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Characteristics of the Nujiang River runoff for a long term and its response to climate change

Science Bulletin 2007年第S2期 156-163页

作者： ZHANG WanCheng~(1+) XIAO ZiNiu~1 ZHENG JianMeng~2 REN JuZhang~2 1 Yunnan Institute of Meteorology,Kunming 650034,China 2 Yunnan Climate Center,Kunming 650034,China

The Nujiang River runoff increases obviously from May each year,and the runoff dominated 81.9% of the gross annual columns during the period from May to October,which is the rainy season over the *** the mean runoff accounts for 13.65% of the annual columns in each month during the rainy season but only 3% during the dry *** another word,the menstrual runoff in rainy season is as much as 4.5 times that in other *** shows that runoff varies greatly with season and the runoff in the rainy season takes the dominant role in annual *** analysis of the relationship between the river runoff and precipitation results in that the synchronous correlation coefficient is significant from January to April but the correlation with 1 month lag in the other months except in *** on the analyses of precipitation effecUng on the river runoff,it is noticed that the precipitation in May af- fects annual runoff greatly and has a close relationship to the dry *** annual,rainy season and dry season runoff and precipitation are analyzed by wavelet *** results show that the change of precipitation and runoff exhibits the dominant periods with low frequency fluctuation（about 2-4 years）,decadal（about 8 years）and interdecadal（about 16 years）*** change of the annual,rainy season and dry season runoff are consistent with an increased trend,which is evident with 0.05 confidence level except in June and *** data indicate that the average runoff is in- creased by 57.6,28.1 and 85.7 m3/s in every 10 years respectively for annual columns,dry season and rainy *** most obvious change is in October,which increased 111.3 m3/s every 10 *** variation of runoff,temperature and precipitation in Nujiang River drainage basin is primarily consis- *** is revealed that the climate change has resulted in the runoff change in *** is increased maximally in October,secondly in May and the increase amount of yearly runoff can a

关键词： precipitation of drainage area climatic variability monthly runoff Morlet wavelet tendency runoff

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